A card-not-present transaction is any sale in which the cardholder and merchant are not physically present together at the time of the sale. The three most common types of CNP transactions are ecommerce, mail order, and telephone sales. In each case, the customer provides their credit or debit card number to the merchant, who then processes the transaction using an electronic terminal. CNP transactions carry a higher risk of fraud than card-present transactions because it is more difficult for merchants to verify the identity of the cardholder. As a result, CNP transactions are often subject to additional security measures, such as AVS and CVV2 checks.